Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd897bc6859ba71…

MALICIOUS

PDF

72.4 KB Created: 2020-12-15 10:24:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bac53d2377e121abd12010907555eab3 SHA-1: 14adfe0ab14aed656da6d09d5aa998a6e8139936 SHA-256: cdd897bc6859ba715b3e89c15edb49e217fb0469c0f2fca2455ec56f7c5f7c53
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/123?utm_term=beach+bum+rentals+destin PDF link annotation
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/risar_kanuwogibuwonil.pdfIn PDF document text
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/a191d6ff0dc.pdfIn PDF document text
    • https://daxelitifo.weebly.com/uploads/1/3/4/3/134368185/zoveli-mivumorosali.pdfIn PDF document text
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/turovunujigixadob.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/bumesobezemazaleb.pdfIn PDF document text
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/85d0c4621abca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc78c1b54d69c5962361a2f/t/5fd6b22513a48350e81ed43e/1607905830751/78466557570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9833ae61-56d4-4b12-866b-ae4755cbdb5e/25978186644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56faa088-adc1-4483-b78b-a5317e9f29d1/49093236212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2d471e-731a-4f5e-8beb-2965c0fe48e6/dj_total_drama_voice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8fba20-60c5-4c29-8931-850ced775b17/85949475723.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce34e9790d063a90a99d52/t/5fd669d79264095525d4b6b2/1607887320572/avg_antivirus_software_free_with_crack.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5313f104edf1d779d1ce4/t/5fd71fd5481cfa31ade0940c/1607933909237/libro_de_colorear_por_numeros_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b1d0bb-3d57-4abe-b648-338b8ae244ce/77754614547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fae7f95-9590-4ea1-bbc1-aebf3fd073ce/jeparit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82903ee4-52f6-45d2-a574-9fda2db05929/22265457.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 5368 bytes
SHA-256: 32697c5655449d33c6015223fc232b59ecede8f62ca18da8abe5a980bdb91724
font_01_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 10392 bytes
SHA-256: a50f4ad01e9406b73570464ac0f1c2df6d68470c6ff051a94762866ba55739fc

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